A Wacan Berry is a berry introduced in Generation IV that weakens the power of super-effective Electric-typemoves. Pokémon such as Gyarados are recommended to hold this berry while battling Electric-type Pokémon.
DPPt － There is a girl in a house west of the Pastoria CityPoké Mart that will give the player a rare berry once a day. Sometimes, you'll get a Wacan Berry.
HGSS － Sometimes the player's mom will buy 5 Wacan Berries if the player allows her to spend his/her money.
In Pokémon X and Y, the player can obtain this berry by defeating Inver in the house on Route 18 or by picking it up from the Berry tree on Route 18.